Question

Please save the program with the name ‘triangle.c’

Answer 1

Answer:

1. #include <stdio.h>

2. int main()

3. {

4.     int k;

5.     int j;

6.     int i;

7.     int array[7];

8.     array[0] = 1;

9.     for (i = 1; i < 9; ++i)

10.     {

11.        array[i] = array[i-1]*2;

12.        for (j=0; j < i; ++j)

13.        {

14.          printf("%d ",array[j]);

15.        }      

16.        for (k=i-2; k > -1; --k)

17.        {

18.          printf("%d ", array[k]);  

19.        }

20.        printf("\n");      

21.     }  

22.     return 0;

23. }

Explanation:

• From line 1 to 3 we start the main function
• From line 4 to 7 we declare the variables that we are going to be using throughout the program including an array of 7 positions
• On line 8 we initialize the array with one to match the sequence
• From line 9 to 10 we create a for loop to create the 9 sequences of numbers
• On line 11 we assign values to the array by taking the previous value and multiplying it by 2, this way we can create the sequence 1,2,4,8,32...
• From line 12 to 15 we print the ordered array
• From line 16 to 19 we print the inverse array minus one  
• On line 20 we print an enter